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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e54b413a9b5b6bb456e809c78cb05fdcba99d544b1a223d424987057d541c60' 
  AND token = 'uk1X6UHxGv++RHIZ2buEf1IZmel8FhEgN1dvBsZsnqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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