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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f75d7a920d1ad21fb46946012b23c19ad750df04c864cc0a6e90cecfdc3174' 
  AND token = 'UPriNiRXhJX8WMYQe5n3XOO3hjireMG3ZDJ+3VQv0ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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