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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe654b76109b88e843eb49c7c51ce44b8020213c3fa2b2ad29f036b5e0ffa89' 
  AND token = 'wztr4nj8OCTdlsDnnhXIb5eiwZ8lp3szwBiXufhzB5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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