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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1daa89edc1eeed2093e8ca9b39f62d027aa2e784c66b9bb3fe25f4ffbf5d9d' 
  AND token = 'JnW0/WMPEVWeqzowKclAiUQL4/NQQgQ7p5g8d2JKeNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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