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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1151b2b7836a56b05417f860667a9171fc83811fc122c85a118990d60254efa' 
  AND token = 'iIHyLrMd4mLyTom4SoST1dDc3+PP3dq6/04sm+XkJt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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