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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b6cb593120051c18a04e195cb8722c38d114227c4ce9ca83ea937abaf245e9' 
  AND token = 'VrJ+3L9u40vfdh0LUH+/3b9woMtlWcuYW6FoYqdkW5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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