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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d16d2fc5976f0cc26ae0445de9f0cbeab41a35f289422bbe35492eea1f160c9' 
  AND token = 'iB/0zgIMgi/tDi8lOre0W26EPO/Iemx6iY+UGcFRY10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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