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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7034f73d77a0e0084da012d4ce52118610f99ca9aacac1aca0acb29cff852956' 
  AND token = '/Wvou1dBoh6cBBhsYtkm9I8Yqd3hlV3+yizfsJf8NMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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