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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9a6917a546e12c702c0b7dbfdf281618b5671b709cf714ff4e8204c23e2235' 
  AND token = 'VdR8cZNAaHjirHR3yo52Xe4a5c6r2pQRhNic0ieiQnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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