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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddecaf400900a41bbe3d559ab1e5ebc1dda3878f2111547eae84e92d91c718be' 
  AND token = 'M2S2HbABr01lrnwbMpffAq+E5DLE07IJIdj8QcmXm/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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