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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5280ac093e73e862495a9eb5b29d7227d8ff86580bdc8ff2ec88c9426ac187aa' 
  AND token = 'mJRwa1uHRzwy4EfGvpfjTW+fsuAJXI2axKNcEjWlaT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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