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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2e385a8c50abb6a3b89ae8c382d5d56fde15b4dece063a0a8ddbd6b561668d' 
  AND token = 'mzGhZslxInBu8x1rFi8Qzqq3WGUNrYB7wwq1vwqa1b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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