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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca84427fbd4bb0e88ad68e6fd3f85d815e3d9af8c8c99893b0d7f880ec708e07' 
  AND token = 'DqbYN4/fnZ9BCGz7UywwF8sNXHEj4cswMoaHvy1uEbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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