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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262b461a11c066310ed65ed95f8d2b72b73372812e344910a05f8fa2675c7454' 
  AND token = 'pEr6A7bxPiJvcgJdy2dlzudm5ym9IB66Yq/n7KvGzW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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