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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b87f897abc707d1575c6521946c4857340300786d5e9b966c294e20c624773' 
  AND token = 'Jckk3PEHlfHg3DRl0bNfk9mBuzMYQvS3HpxSlY4INuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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