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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f1746b346c8d9a80018ed16a6eb1069132fad78964170a0d474f873d91614a' 
  AND token = 'gyXcP5T1oyawoYEsnC6MWQozLxv7LTtDZkABjvT8gj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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