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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99a52eec5e458e2e24d145d8ad70d4f5ed29c1a290186c2f850fa938657e73d' 
  AND token = 'rF9Rh8TvyzFWepFhw8srOKr7sPXomyFSYxtFmcuJ8Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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