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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0525f4710ce6cc3ac57622680775d88d6bfe57c2368cbbea4764fe07f9210fda' 
  AND token = 'Q0+G5N3qd7CadyIkG33PsKn7woKNXSvOGF0SQnMUpvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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