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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9afd831d1bae05f293bdb7d9d21f12647070e9272dbb02128fb2548ffcf529' 
  AND token = '9VAq3wpVMUaGbF/lqyjkO3eaOAg6K+N3k7V63w35AT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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