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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965262656b173ba930359b9b4a0c8d6f0b8fb52d9060cf49322b45a5fb84cecb' 
  AND token = 'aVAfoTPXHXwtQW3UwodI3d+6appvUDBbuTlufG1n10Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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