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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f62d728f3c36f8368f03aded336f0c8a69c5c78db42afb8dd12a5314f25a84' 
  AND token = 'Xz7NhOypFY1ghPQmv8nb2Ycz2duHenJpDHWNNwmogkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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