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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3d94ef7308ffd6ff9df6e9132b8362dc1f3bf5ea5fca52c88db42078ca2ca5' 
  AND token = 'EoH9xyD907F6N0xSkzjH1wS6cZ6k5GhP/jFVKN/QEpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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