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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b786c6793a08fb502eae8e0061dee7ea2a3547fa3ec462d0279a9a4c6b3e835' 
  AND token = 'GK9ZrZXEEDCRmv2n76KEeuofI2qBS6zR/N9akf7aWa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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