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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bc12a05efabdcf31a4419eebcb102c1b4749948c3c6a3e14b36cceab461c8a' 
  AND token = 'wJ3GN102OMWdR2FCu22pSl9E/CmD0mrLVSKA8IUz5dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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