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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f118dd08762e13fe8f5da3d7b36788661c70b627012b86112ad5dae3a8dade' 
  AND token = '8MMiT+kFBb/iosfZhfIXxMtA4HpfmQ+TzOMawubpSsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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