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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99fc27f8692179c04b2189a1e4491a5310f4b26b4b6950fbf0cf8f30c266be40' 
  AND token = 'qbqo+T5SCUcm47m1Vwu09aXso5Hx54PLS5v3aRCmMsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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