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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed321783b70e50d0efa9dc863f213d2baedd009acaf94528f38d4bd02da9a4b7' 
  AND token = 'xgG9rxI04BOdxmOtu0brLPRvKiOzC2xqL5TiWMuEbBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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