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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6aaeb9e813e8f572217e19ccce4ff698c0de38ce296745474fe74553708fe86' 
  AND token = '/9tv8suxP+Suc1Xn/tfZGgoFh6wedHrK5jPPpPEHhxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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