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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40aba640b6ded4761d1677a6fa7df85bb445f904e210b5f3200b9154d776ed1' 
  AND token = 'IYAIKUFcIhnUUD+Vz/IaxMa7KFYoh8ip1kyHyzoY25k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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