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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb0cb89eebc4a222c2b914e44b341176f6e38413a2ef53d7485346d71ba6611' 
  AND token = 'XR1p9si0AVkNC8gYcWMDi/yWHdSFRw3/oBvOIDgBtTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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