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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd467aa32548d4bf3a9e128b56a85e9561afaabb7897dcd2a0a4701a38715ecd7' 
  AND token = 'PgAw1ohB741bh9wnQg7pSi1ag2vXy2cdb4hEIbhBuJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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