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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a08ed53518786d736d1002e7513b1c0b76948d8c1570f9c7bf43ae9ae91e40c' 
  AND token = 'b2/KcywTl8kGspO0RBd6YGfFCw7Uj6swugB9lfw6JsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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