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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b41646a0bdd4ca4bf7a325e70fe030d9c25514cd63f6a80635856d9fecb6cf' 
  AND token = 'AZg4t2bJASXG8E/Rmsf9NtqkeO6YrowAb07Jp6J7GJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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