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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf7d1a46d2eceb7b4ce9f128519494793056585070b205c7b5887d2f25c2733' 
  AND token = 'W5eSsIr4pbX0tyfJaGfvyLW0uySxJFKtLEfrMCbUHIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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