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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188c3dcf65607bda276dc8a7450db2ecc1b10426873358f47e85eef5ad42b569' 
  AND token = 'JEKq3OaOH9smOiZXM2wDPE31vJFo3UChLl6kS8iN4bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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