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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c7c9b44566ae04ea3a0a3d10beb71d3ecc31d5e79aec67981b82d5f4756e91' 
  AND token = 't0LHejOxsUVDe45b68c2JccKf9Igk5kfCHddMjZF58A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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