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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5af0ff70d5b6b01ba01f3ce739924b6f29c27055a1d323529ca5d17d114a790' 
  AND token = '31tFwJniBwtqKaooSkJv/Oo6DMQpEunZyVqbUyHydx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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