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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d30cb5c708c6979a7ec2c5dfbd50788f95edceb2bda3671341630e62cc2f8a' 
  AND token = '7cvaNF/um2onLbN/EOqUcG+PGPDjDAztdLGwJ6VIsDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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