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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eed3f177e63638fdc401f8c5075a0ea98a7f26dd9b0201c93f3bf476b01b6de' 
  AND token = '7xhohua9CY15g30AQB0fHQ4kriK+HjxID/NbyEC1HYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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