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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e5fad3d5afacaed908750ef23b234a4d09cc3e9ee40a3fe5ee7beb67377c09' 
  AND token = 'cN4iIoMvc0mIG9VmnQIG71QxCJhVyr59ErmKfNnC27o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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