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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d7cc68d66aea8e21538e9de445f965c5ee49589fe2c7d2509ce2cc40d9cee4' 
  AND token = '56zWRH3Sl87CsncXPrO4vWbJ+McgYlUtcGsw6FYAg98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00235

JSON explain

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