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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2adc8208de126ae4a49f33998567d5044032b23290dec52d8189ddaf0c95c7b' 
  AND token = 'lg9C9rl9E0UssACNiTO1faaOiSk1rHRT784TubP1TT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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