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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372c0fc88e250ef0ce492a50e431705f29ba9a6c4a0b06b5420eb0d8e81aad8b' 
  AND token = 'Yhuq3Ij2kiMs/2+zYjH35X85s2Oydg8rCknl462guC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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