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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe284b3a62c16ada33cf7d560ef8642360cf65f2d965088bad479ec39903021' 
  AND token = '8SO79by4anDEjX6sfqjCPsMy7R0SWiCNiwO7GtkjVd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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