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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f2c86c64ec2b79d012903cde9a8f644bea042b35ce0c14f9020d5ebe9f6de7' 
  AND token = 'ljb2qxq7KLWohwByfK1435NYlbkuoIsIfDDQ/32p0/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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