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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfa11e4fb21db3f2911c64cabae76885a03bd3cf072405ab7b718f1feb7d330' 
  AND token = '3dB7hR7WK1ajQtVOmXNSL21RRDeqyby9xIGPs7DHwo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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