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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014724f348a8c8fb3f3f5e416ffb8bd86b234754e5bc6f3edce8ef38fef677a3' 
  AND token = '0E56Pg5ywsta90BWapWSZ7kQsybZHcqalXvgYG9Sags=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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