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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947be951e9c1d4d1a63c40df558e0e4c0b6797be372d75481563f544fbaea21b' 
  AND token = 'jH1fpF9hu96Q2+ejKrYy8jMi7uZ/4fu8oN6htCZnDJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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