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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621a8c50b4c5bc611e39893a7cf4db48417f898007d643bd42a46c0d342b9d97' 
  AND token = '9J8Xwfza+T1ybaCli644H9ZIL2hEjjQxwCVaHwEkgN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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