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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb939a892b80a7fc02fd323b616e57a86ae8a5a0756a0d54f31f7cd4800fdae5' 
  AND token = 'bqmvPkxNJCqFU5iQPvWf4HbJ5eNt4InZ8kmAyJVmwMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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