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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc56b9fd828d2aea6325b053490b0eda7f4b8ffe81cd2bc061a967d26c08e450' 
  AND token = 'Wk/bED5/B+4XBaHJA3zn5J11Yx17FiIQMb1GEZ4a87E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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