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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc27039831ba5d4a1411e823661c565015077d58afcffd9583d35ec1117c2db3' 
  AND token = 'Zr4zustIb29yz/05XUekwaALRUSldyBiiSKvry/PmVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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