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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b114b0018fceef96e2bfd774a361b49a203869369a23e41ce61061b019bf869d' 
  AND token = 'ms/qFqMDb5PgT350AjA+nZ5+67ao2aMK4qruKJqPMpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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