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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae2f5678720a4b12448a2d6f5cd3048d0bb7f5e2b98525334075bf8a25d3074' 
  AND token = 'XXslhM6azrFMe7JGbBPd9ul0OCR7mWUhCtaj8VCLi24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}