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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eab362fe339ae833cd9b52cdc3f336d972787b0ee8aac189b992fae4952b2cd' 
  AND token = 'OAbcYaW+hlGMn20/x7lE1nV5OatDSYzz1kODGbMQgvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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