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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a09c4c98da7c2ac573652f5024578d5173048b1d12fd8e8683a9659186b3a61' 
  AND token = 'RBmXCspa10PLf5IUih1+jTy4Dw3XdOMJLrSfWmRdPVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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