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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0987c074481d123c9c9797d089508d366d0be1ded239cf7dcf9b5d9abaae5d6' 
  AND token = 'IYh++iNotRYKejQAW9ehlsk6IXsthhVfFdm9vl+RH2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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