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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269892ee02e887755ec2372e3fea8391384f516f40bde096c5fdbb026b9f26e5' 
  AND token = '+9xwNZ3S8UW8p9hEyRuRi4vZKiWe7Xhjo+3ac8OUZOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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